Method for demulsification of emulsions containing dense gas and

Details Method for demulsification of emulsions containing dense gas and Method for demulsification of emulsions containing dense gas and

1998-09-08

2000-07-11

Simmons, David A.

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210640, 210708, 95 46, 95 51, B01D 1704, B01D 5322

Patent

active

06086768&

ABSTRACT:
Emulsions containing dense gas, liquid and a surfactant which may have been used for extraction of a solute from a substance or for other purposes are demulsified by passage through a membrane contactor. An emulsion flow path in the contactor is separated from a dense gas and surfactant flow path by membrane having pores which enable passage of the dense gas and surfactant constituents of the emulsion through the membrane while inhibiting passage of the liquid and any solute which may be therein. The membrane may be a plurality of hollow fibers. A portion of the recovered dense gas may be vaporized, temperature adjusted and be repressurized and be redirected into the dense gas and surfactant flow path to increase processing rate. Recovered dense gas and surfactant may be returned to the emulsion source for reuse therein.

REFERENCES:
patent: 5490884 (1996-02-01), Robinson et al.
Tirmizi et al, Demulsification of Water/Oil/Solid Emulsions . . . , AIChE Journal 42(5) (1996).
D.A. Newman et al, Phase Behavior of Fluoroether . . . , Journal of Supercritical Fluids 6, p205-210 (1993).
K.P. Johnson et al, Water-in-Carbon Microemulsions . . . , Science 271, 626 (1996).
K. Jackson et al, Microemulsions in Supercritical Hydro . . . , Langmuir I 2(22) 5289-5295 (1996).
E. W. Kaier et al, Physical Chemistry, 96, 458 (1991).
D. G. Peck et al, Physical Chemistry, 95, 9549 (1991).
D.J. McFann et al, Phase Behavior of AOT . . . , Physical Chemistry 65 p4889 (1991).
Roubi, Colorful inorganic chemistry . . . , C&EN Aug. 11, 1997 p40.
K. Johnston, Supercritical CO.sub.2 Extracts Biomolecules, Inside R&D vol. 25 No. 7, Feb. 14, 1996.
Author unknown, "Liquid Assets", Food Processing Oct. 1996, p77.

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